WO2020057529A1

WO2020057529A1 - Stator core, electric motor stator and electric motor

Info

Publication number: WO2020057529A1
Application number: PCT/CN2019/106339
Authority: WO
Inventors: 刘元江; 刘鹏; 周忠厚; 陈志�; 曹娟娟; 刘元宜
Original assignee: 歌尔股份有限公司
Priority date: 2018-09-18
Filing date: 2019-09-18
Publication date: 2020-03-26
Also published as: CN109286250A

Abstract

Disclosed are a stator core, an electric motor stator and an electric motor. The stator core comprises a first core (1) and a second core (2) assembled together, wherein the first core (1) is provided with multiple circumferentially distributed stator teeth (12) extending out towards the second core (2), with a stator slot (11) with an opening being formed between adjacent stator teeth (12); and the first core (1) and the second core (2) are configured in such a way that after the first core (1) and the second core (2) are assembled together, a side wall of the second core (2) blocks the opening of each stator slot (11). The problem of difficult winding of a stator core with closed slots is solved.

Description

Stator core, motor stator and motor

Technical field

The present invention relates to the field of motors, and more particularly, to a stator core, a motor stator, and a motor.

Background technique

Permanent magnet synchronous motor is a synchronous motor that generates a synchronous rotating magnetic field by permanent magnet excitation. Permanent magnet synchronous motors have been widely used in some automated mechanical equipment, robots, electric vehicles and other fields due to their many advantages such as low loss, high efficiency, light weight, convenient control, constant speed, and stable and reliable operation.

The stator core in a permanent magnet synchronous machine usually has a cogged structure. Among them, the teeth on the stator core are used to guide the magnetic lines of force to reduce magnetic resistance, and the slots on the stator core are used to inlay windings and hinge with the magnetic lines of force in the teeth. However, due to the different magnetic permeability of the teeth of the stator core and the slots of the stator core, the rotor has different numbers of magnetic lines of force at different positions. At the position where the magnetic poles are aligned with the teeth of the stator core, the magnets attract each other, which will hinder them. The rotation of a permanent magnet synchronous motor, and this phenomenon is called the "cogging effect" of the permanent magnet synchronous motor. In fact, in the application of the motor, it is found that the "cogging effect" will cause the motor speed to fluctuate, which will cause the motor to have undesirable phenomena such as position control errors and vibrations, which will eventually affect the performance of the motor such as smoothness.

In order to reduce the "cogging effect" of the motor, a closed slot stator core has appeared in the prior art. The characteristics of the closed slot stator core are that the slots on the stator core are closed. This structure can effectively reduce and even avoid the "cogging effect" in use, but the closed slot structure has a relatively large problem in stator winding: the process of winding with automatic winding equipment is implemented It is more difficult, so currently only manual winding can be used for the stator core of the closed slot. However, the manual winding method has the problem of higher cost but lower efficiency.

It can be seen that it is very necessary to develop a new stator core with a closed slot structure to solve the defects in the prior art.

Summary of the Invention

An object of the present invention is to provide a new technical solution for a stator core.

According to a first aspect of the present invention, there is provided a stator iron core including a first iron core and a second iron core assembled together; the first iron core is distributed along the circumferential direction with a plurality of parts facing the first iron core. The stator teeth protruding from the two iron cores are used for winding the coils in advance, and stator slots with openings are formed between adjacent stator teeth. The first and second cores are configured as: After the core and the second iron core are assembled together, the side wall of the second iron core closes the opening of each stator slot.

Optionally, a plurality of the stator teeth are uniformly distributed on an outer ring of the first core, and the second core is assembled outside the first core.

Optionally, a plurality of the stator teeth are evenly distributed on the inner ring of the first core, and the second core is assembled inside the first core.

Optionally, a plurality of recesses corresponding to the plurality of stator teeth are provided along an inner surface or an outer surface of a side wall of the second iron core in a circumferential direction, and adjacent stator recesses are formed with the stator. A raised portion corresponding to the opening of the groove.

Optionally, a shape of the recessed portion is adapted to a shape of an end portion of the stator tooth, and an end portion of the stator tooth and the recessed portion are coupled together in an inserting or engaging manner.

Optionally, the shape of the convex portion is adapted to the shape of the opening of the stator slot, the convex portion covers the opening of the stator slot, and the convex portion is configured for closing An opening of the stator slot.

Optionally, the stator slots are fan-shaped, circular, oval, U-shaped, V-shaped, rectangular, or trapezoidal.

Optionally, the first core is formed by laminating multiple stator punches; the second core is formed by laminating multiple stator punches.

According to a second aspect of the present invention, there is provided a motor stator including the stator core according to any one of the above.

According to a third aspect of the present invention, there is provided a motor including the above-mentioned motor stator.

The inventor of the present invention found that in the prior art, when the stator winding of a closed-slot stator core is being wound, there is indeed a problem that it is difficult to use an automatic winding device for winding because the slot is completely closed, and manual winding is used. Not only is the cost high, but the efficiency is very low. Therefore, the technical task to be implemented or the technical problem to be solved by the present invention is never thought or expected by those skilled in the art, so the present invention is a new technical solution.

The stator core provided by the embodiment of the present invention can realize the opening or closing of the stator slots by assembling. The structural design can effectively reduce or avoid the cogging effect, and is also beneficial to winding the stator teeth by using automatic winding equipment.

Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

FIG. 1 is a top view of a stator core provided by an embodiment of the present invention.

FIG. 2 is a top view of a first core in a stator core according to an embodiment of the present invention.

FIG. 3 is a top view of a second core in a stator core according to an embodiment of the present invention.

FIG. 4 is a side view of a stator core provided by an embodiment of the present invention.

Reference sign description.

1. The first iron core, 2. The second iron core, 11. The stator slot, 12. The stator teeth, 21. The recessed part, 22. The raised part, 3. The stator punch.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is actually merely illustrative and is in no way intended to limit the invention and its application or uses.

Techniques, methods, and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but where appropriate, the techniques, methods, and equipment should be considered as part of the description.

In all examples shown and discussed herein, any specific value should be construed as exemplary only and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, so once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

The stator core provided by the embodiment of the present invention can be used in a motor, especially in a permanent magnet synchronous motor, which can effectively reduce or even avoid a cogging effect, and has the characteristics of convenient stator winding.

FIG. 1 is a top view of a stator core provided by an embodiment of the present invention. FIG. 2 is a top view of a first core in a stator core according to an embodiment of the present invention. FIG. 3 is a top view of a second core in a stator core according to an embodiment of the present invention. FIG. 4 is a side view of a stator core provided by an embodiment of the present invention. Now taking FIG. 1 to FIG. 4 as examples, the structural characteristics and principles of the stator core provided by the embodiment of the present invention will be described.

An embodiment of the present invention provides a stator core, as shown in FIG. 1, FIG. 2, and FIG. 3, including a first core 1 and a second core 2 assembled together; A plurality of stator teeth 12 protruding toward the second iron core 2 and used to wind the coil in advance are distributed to each other. A stator slot 11 having an opening is formed between two adjacent stator teeth 12. The first iron core described above 1. The second iron core 2 is configured: when the first iron core 1 and the second iron core 2 are assembled together, the side wall of the second iron core 2 closes the openings of the stator slots 11 so that each The stator slot 11 forms a closed structure.

In the above-mentioned structure of the stator core, the first core 1 and the second core 2 both have a ring structure, and are mutually matched in shape so as to be able to be assembled together.

The stator core provided by the embodiment of the present invention has the characteristics of simple structure. The first iron core 1 and the second iron core 2 are designed as a separable structure, that is, the first iron core 1 and the second iron core 2 can be separated from each other, or the two can be assembled together by assembly. Specifically, when the first iron core 1 and the second iron core 2 are separated from each other, each stator slot 11 on the first iron core 1 is an open structure. This design facilitates winding the stator teeth 12 by using an automatic winding device. The sub-winding is formulated to solve the problem of the difficulty of automatic winding existing in the existing closed stator slot. In particular, when the first iron core 1 and the second iron core 2 are assembled together, the side walls of the second iron core 2 can completely close all the openings of the stator slots 11 on the first iron core 1. At this time, the first All stator slots 11 on the iron core 1 form a closed structure. Such a design can effectively avoid the cogging effect in use.

Among them, the first iron core 1 and the second iron core 2 may be joined together in a clearance fit manner. The gap fitting method is relatively simple to implement, but can realize the movable connection between the first iron core 1 and the second iron core 2, so that the disassembly and assembly of the first iron core 1 and the second iron core 2 are more convenient. Especially when winding the stator windings of the stator teeth 12 to form sub-windings, automatic winding can be realized, which has many advantages such as high efficiency and good winding consistency.

Optionally, a plurality of stator teeth 12 are evenly distributed on the outer ring of the first iron core 1, and the second iron core 2 is assembled outside the first iron core 1.

Wherein, the openings of each stator slot 11 face the radial outer end of the first iron core 1, and the second iron core 2 is assembled on the outer ring of the first iron core 1, and the side wall of the second iron core 2 can be used to The openings of all the stator slots 11 on the first iron core 1 are completely closed, that is, the side wall of the second iron core 2 can be used to close the entire outer ring of the first iron core 1, that is, the second iron core 2 can The peripheral surface of the outer ring of the first iron core 1 is completely closed. In use, the closed form of the stator slot 11 can effectively reduce or avoid the cogging effect, which is beneficial to the smooth operation of the motor.

Optionally, the plurality of stator teeth 12 are evenly distributed on the inner ring of the first iron core 1, and the second iron core 2 is assembled inside the first iron core 1.

Wherein, the openings of each stator slot 11 face the radially inner end of the first iron core 1, at this time, the second iron core 2 is assembled on the inner ring of the first iron core 1, and the side wall of the second iron core 2 can be used to The openings of all the stator slots 11 on the first iron core 1 are completely closed, that is, the side wall of the second iron core 2 can be used to close the entire inner ring of the first iron core 1, that is, the second iron core 2 can The circumferential surface of the inner ring of the first iron core 1 is completely closed. In this way of cooperation, each stator slot 11 on the first iron core 1 can also form a closed structure that can reduce the cogging effect.

Optionally, a structure of the second iron core 2 is as follows: Referring to FIG. 1 and FIG. 3, an inner surface of a sidewall of the second iron core 2 is provided along the circumferential direction corresponding to a plurality of stator teeth 12. A plurality of recessed portions 21 are formed between adjacent recessed portions 21 to form a protruding portion 22 corresponding to the opening of the stator slot 11. The second iron core 2 of this structure can be assembled on the outer ring of the first iron core 1 when in use, so as to close the openings of all the stator slots 11 on the first iron core 1 through the side walls.

Optionally, the structure of the second iron core 2 described above may also be: a plurality of recessed portions corresponding to a plurality of stator teeth are provided along an outer surface of a side wall of the second core 2 in a circumferential direction, and adjacent recessed portions are provided. A convex portion corresponding to the opening of the stator slot is formed therebetween. The second iron core 2 of this structure is suitable for being assembled on the inner ring of the first iron core 1 when in use, so as to close the openings of all the stator slots 11 on the first iron core 1.

Among them, in order to facilitate the assembly of the first iron core 1 and the second iron core 2, the number of the recessed portions 21 on the second iron core 2 is the same as the number of the stator teeth 12 on the first iron core 1, and the second iron core 2 is convex. The number of the rising portions 22 is the same as the number of the stator slots 11 on the first iron core 1, so as to realize the cooperation between the stator teeth 12 and the recessed portions 21 and the convex portions 22 and the stator slots 11 so that the first iron core 1 It is well assembled with the second iron core 2.

Further, the shape of the recessed portion 21 is adapted to the shape of the ends of the stator teeth 12, and the ends of the stator teeth 12 and the recessed portions 21 may be combined together by means of inserting or engaging.

In one example, the shape of the ends of the stator teeth 12 may be arc-shaped, and the recessed portions 21 are arc-shaped grooves matching them, so that the ends of the stator teeth 12 and the recessed portions 21 cooperate well.

Among them, the way of inserting or engaging is favorable for assembling the first iron core 1 and the second iron core 2 firmly together. These assembly methods are relatively simple, easy to implement, and do not increase manufacturing costs.

Further, the shape of the protruding portion 22 is adapted to the shape of the opening of the stator slot 11, the protruding portion 22 covers the opening of the stator slot 11, and the protruding portion 22 is configured to close the opening of the stator slot 11. . When the opening of the stator slot 11 is closed, a closed stator slot is formed, which can effectively reduce the air gap magnetic resistance, reduce the cogging effect, and facilitate the smooth running of the motor.

Wherein, the protruding portion 22 may be combined with the slot of the stator slot 11 by means of buckling, engaging, etc., so as to close the slot of the stator slot 11.

Further, the shape of the stator slot 11 can be flexibly selected according to actual needs. On the first iron core 1, a stator slot 11 is formed between two adjacent stator teeth 12 through which a stator winding can pass.

The stator slot 11 may be fan-shaped, circular, oval, U-shaped, V-shaped, rectangular, or trapezoidal. It is only necessary to ensure that the slot bottom thickness of the stator slot 11 is thin, for example: the slot bottom thickness is 0.3mm-0.5mmm. This design can effectively reduce the phenomenon of leakage magnetic flux, and can improve the performance of the motor after being applied to the motor, ensuring The motor runs smoothly. The shape of the side wall of the stator slot 11 and the opening of the slot is not limited in the present invention.

Further, the first iron core 1 and the second iron core 1 are each formed by laminating multiple stator punches 3. Such a design manner facilitates the production and processing of the first iron core 1 and the second iron core 2. When the first iron core 1 and the second iron core 2 are assembled together, referring to FIG. 4, it can be seen that a laminated structure is formed.

The stator punches forming the first iron core 1 have a ring structure, and the stator punches forming the second iron core 2 also have a ring structure.

Wherein, during the lamination, a plurality of stator punches 3 may be fixed by using fasteners, and the fasteners may be rivets, for example. In addition, multiple stator punching pieces 3 may also be joined together by welding. Of course, the multiple stator punching pieces 3 can also be combined in other ways, which is not limited in the present invention.

Among them, the stator punch 3 can be a cold-rolled silicon steel sheet or a hot-rolled silicon steel sheet with a thickness of 0.25mm-0.5mm. Such a design can effectively reduce eddy current loss and hysteresis loss, and reduce the heating of the iron core. When the thickness of the silicon steel sheet is thin, it can significantly reduce eddy current loss and reduce core heating, but it is not easy to be too thin, otherwise it is not easy to process and it will increase production costs.

In another aspect, the present invention also provides a motor stator including the stator core as described above. The stator core is configured such that a stator winding is wound in advance on the stator teeth of the first core. The motor stator provided by the invention can directly wind the stator winding on the stator teeth, and has the characteristics of convenient and fast winding.

Further, a winding slot is provided on an outer wall of at least one stator tooth 12 of the first iron core 1, and a stator winding is wound in the winding slot. The stator winding is a copper coil winding.

The above-mentioned motor stator can be applied to a motor, especially to a permanent magnet synchronous motor. The motor stator can improve the air gap magnetic density of the permanent magnet synchronous motor, and avoid the cogging torque of the permanent magnet synchronous motor, and finally can effectively improve the motor performance.

In another aspect, the present invention also provides a motor including the motor stator as described above.

The above-mentioned motor stator is used in the motor, thereby improving the overall performance of the motor. The motor can be used in many fields such as electric vehicles or robots.

Other components of the motor according to the embodiment of the present invention, such as a rotor and the like, and operations are known to those skilled in the art, and the present invention is not specifically limited herein.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims

A stator iron core, comprising a first iron core and a second iron core assembled together;

A plurality of stator teeth extending toward the second core and used for pre-winding a coil are distributed along the circumferential direction on the first core, and stator slots with openings are formed between adjacent stator teeth. The first iron core and the second iron core are configured: when the first iron core and the second iron core are assembled together, the side wall of the second iron core closes the opening of each stator slot.
The stator core according to claim 1, wherein a plurality of the stator teeth are evenly distributed on an outer ring of the first core, and the second core is assembled on the first core. Outside.
The stator core according to claim 1, wherein a plurality of the stator teeth are uniformly distributed on an inner ring of the first core, and the second core is assembled on the first core. internal.
The stator core according to claim 1, wherein a plurality of recessed portions corresponding to the plurality of stator teeth are provided along an inner surface or an outer surface of a side wall of the second core along a circumferential direction. A convex portion corresponding to the opening of the stator slot is formed between adjacent concave portions.
The stator core according to claim 4, wherein a shape of the recessed portion is adapted to a shape of an end portion of the stator tooth, and an end portion of the stator tooth is engaged with the recessed portion. Or snap together.
The stator core according to claim 4, characterized in that the shape of the raised portion matches the shape of the opening of the stator slot, and the raised portion covers the opening of the stator slot, The protrusion is configured to close an opening of the stator slot.
The stator core according to claim 1, wherein the stator slots are fan-shaped, circular, oval, U-shaped, V-shaped, rectangular, or trapezoidal.
The stator core according to claim 1, wherein the first core is formed by laminating multiple stator punches; and the second core is formed by laminating multiple stator punches.
A motor stator, comprising the stator core according to any one of claims 1-8.
A motor, comprising the motor stator according to claim 9.